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        /*伪元素选择器*/
        /* 选中第一个字母*/
        li::first-letter{
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<ul>
    <li>As long as the effort of deep strokes fell great oaks</li>
    <li>只要功夫深，铁杵磨成针</li>
    <li>深いストロークの努力が大きな樫の落ちた限り</li>
</ul>
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